yeah...the idea was not to use the 40MHz clock...it was just what I happened to have. I've now moved to a 2520 with built in osc Michael Rigby-Jones wrote: >-----Original Message----- >From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] >On Behalf Of alan smith >Sent: 31 May 2007 15:54 >To: Microcontroller discussion list - Public. >Subject: RE: [PIC] resonators > > >Thanks for the replies. Interesting, the resonator with no >caps....is oscillating at its rated frequency but maybe it >doesnt have enough drive for the PIC. I hope thats the issue >with not running in debug, pretty sure it is since I had a >40MHz xtal on it, and it seemed to work, just didnt want to >run the part at 40Mhz. So I'll drop a couple caps on and see >what happens. The maximum clock frequency using a crystla/resonataor in HS mode for the 18F252 is 25MHz. To run at 40MHz reliably you either need to provide an external clock (e.g. canned oscillator) or use a 10MHz crystal and the internal PLL. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --------------------------------- Need a vacation? Get great deals to amazing places on Yahoo! Travel. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist